Grails database action and view rendering

Question

I'm trying to add a simple functionality to my Grails project that similarily to youtube will allow users to like/unlike an article. There's a very primitive page to display articles with their likes and a controller that makes 'liking' possible. Alas, whenever this method is called, it tries to render an unexisting view instead of coming back to the previous one. Here's the .gsp body code:

<g:each in="${articles}" var="article">
        <table class="table-bordered">
            <tr>Article title: ${article.title}</tr><br>
            <tr>Author: ${article.author}</tr><br>
            <tr>Page: ${article.page}</tr><br>
            <tr>Likes: ${article.getLikesCount()}</tr><br>
            <g:link resource="Article" action="articleLiked" id="${article.id}" params="[articleId: article.id]">Like it!</g:link>
        </table>
    </g:each>

And this is my controller's 'like' method code:

def articleLiked(Article article){
        ServiceUser user = springSecurityService.currentUser
        ArticleLike al = ArticleLike.findByArticleAndServiceUser(article, user)
        if(al){
            al.liked = true
        }else{
            al = new ArticleLike(Article: article, ServiceUser: user, liked: true)
        }
        al.save()
        showArticleList()
    }

As a result, I've got this exception:

Error 500: Internal Server Error

URI
    /article/articleLiked/1
Class
    javax.servlet.ServletException
Message
    Could not resolve view with name '/article/articleLiked' in servlet with name 'grailsDispatcherServlet'

Also, even after I manually go back to the articleList page, the value of getLikesCount() method output is still 0. What's causing all this trouble?

UPDATE:

Just in case you were wondering, my showArticleList() method looks like this:

def showArticleList(){
        render (view: 'articleList',  model: [ articles: getArticle(), articleLikes: getArticleLike()]);
    }

abdul abdul · Accepted Answer · 2018-03-14T07:27:48

A couple of things ,

def articleLiked(){

ServiceUser user = springSecurityService.currentUser
Article article = Article.get(params.id)
ArticleLike al = ArticleLike.findByArticleAndServiceUser(article, user)

// the rest of your code

And you should use redirect if you want to redirect to another action. so change showArticleList() to redirect(action: "showArticleList") } That should work.

Grails database action and view rendering

2 Answers